Spring-lancet



UNTTED sTATEs PATENT oEEioE.

JACOB H. GEMRIG, OF PHILADELPHIA, PENNSYLVANIA.

sPEiNG-LANCET.

Specification of Letters Patent No. 4,450, dated April 11, 1846.

To all whom t may concern.'

Be it known that I, JACOB II. GEMRIG, of the city of Philadelphia, inthe county of Philadelphia and State of Pennsylvania, have invented anew and-Improved Spring- Lancet for the Surgical Use of Phlebotomy,which I call Gemrigs Spring-Lancet; and I do hereby declare that thefollowing is a full, clear, and exact description of the constructionand operation of the same, reference being had to the annexed drawings,making a part of this specification, in which- The first figure, markedA, represents the outside case; B, a hollow tube; C, the head, intowhich runs from the lower end a screw hole; D, the inner case (w) ablock fast to the bottom of the inner case., a. screw hole in the top ofthe block to which is to be attached the catch spring (7a); E, theshaft,

. to the lower end of which is attached the regulating screw (x). F, thespiral spring; G, a washer; II, the key for the washer; K, the catchspring;-'U, a screw-41 the catch; M, the button or trigger.

Materials: 'Ihe lancet and springs should be made of steel, all theother parts be made of brass, silver, or any other convenient metal orcomposition of metals; the case A, the tube B, and the crown of the headC, may also be made of tortoise shell, mother of pearl, horn or otherconvenient materials.

Construction: To put the parts of the instrument together the regulatingscrew (ai), must be putthrough the upper part of the inner case (D),entering at the opening (a), the shaft will then be at the bottom'of theinner case, as represented in the drawing N. The catch spring K,(without the but-- ton) is then laid upon the shaft, and attached to theinner case, by the screw lv, entering the block w. The spiral spring F,is then put into the upper end of the inner case D, over the regulatingscrew (m), until it rests upon the top of the shaft E, at

(6)-the washer G, is then put into the upper end of the case (forcingdown the spiral spring until the washer is below the slit (o) behind thewasher; keeping the washer and spiral spring down to their places. Thetube B, is then put on the upper part of the inner case: the head C, isthen put on by turning it down upon the regulating screw, until theshoulder on the head comes in contact with the top of the tube B. Theoutside case A, is then put on over the inner case. The button is theninserted into the hole in the back of the outside case, opposite to thehole marked T, in the inner case, and screwed fast to the catch spring.

To regulate: To regula-te the range of the lancet, or depth of cut,continue to screw the head as in the act of putting it on,- this causesthe regulating screw to advance into the head, thus withdrawing thelancet within t-he case, and shortening the range: reverse ther motionof the head to lengthen the lancet.

To set: The instrument complete is represented by the drawing Z, bytaking hold of which at (11,) and then pulling out the top,--the lancetis drawn back until the end of the shaftI is locked by the catch spring.

To cut: Then by pressing upon the button, the catch is detached from theshaft, and the lancet flies out, being driven forward by the spiralspring.

Claim: IVhat I claim as my invention and desire to secure by LettersPatent, is-

The manner in .which I have combined stroke of the blade.

J. H. GEMRIG. Witnesses present at signing:

C. BRAZER, BENJAMIN C. EVERETT.

